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18th Street Viaduct Preliminary Design


City of Sioux City, Iowa

  • Developed future viaduct and roadway configurations to improve accessibility and efficiency within the Hoeven Valley, decrease potential for train-vehicle collisions, and reduce traffic congestion at three railroad crossings which can be blocked by trains for extended periods
  • Prepared environmental studies, including a noise analysis, environmental justice evaluation, and traffic study for eight intersections within the study area
  • Provided support for Public Meeting
  • Updated Hoeven Valley Transportation Plan
  • Assisted with TIGER grant application
  • Following approval of the NEPA Categorical Exclusion, prepared final engineering design for traffic and structural components